Figure 4

(a) CV curve of HTPC-H-160 tested at 0.1 mV s⁻¹, (b) Discharge–charge curves of HTPC-H-160 at 20 mA g⁻¹; (c) Cycling performance of HTPC-H-160 at the current densities of 20 mA g⁻¹; (d) Rate performance of HTPC-H-160 at the current densities of 20, 50, 100, 200 and 20 mA g⁻¹. (e) Cycling performance of DPC-H at the current densities of 20 mA g⁻¹, the inset is the discharge–charge curves; (f) Nyquist plots of HTPC-H-160 and DPC-H electrode.